Fluid-operated pump piston device



"Feb, 21, 1939. c. J. co'BERLY -OPERATED PUMP PIsToN DEVICE `FLUID Original Filed April 2l, 1937 CLAR/s/vce l Coat/PLV Patented Feb. v21, i939 l 2,147,766

UNITED STATES PATENT OFFICE einem J. com, nu' angeles, cnn., namur to Boho corporation, lleno, Nev., a corporation of Nevada origini application April zi, mi, sei-ax No. 133,173. Divided andfthis application January 20,1333, SeriaiNo. 137,017

Claims. (Cl. 10S-48) The subject matter of this application is shown they engage. A feature of the invention is to but not claimed in my Patent No. 2,081,223, isprovide a means for connecting the rods to the sued May 25, 1937, for Fluid operated deep well pistons so that they will be practically concenpump, ,andthis application is a division of my tric, but at the same time the rods are provided 5 'copending application Serial No, 138,176, tiled with sumcient flexibility of connection with the 5 April 21, 1937, for Valvefor huid-operated pump pistons to compensate for small deviations from mechanism. perfect axial alignment of cooperating parts. To

Objectsand features of the invention will be accomplish this result, each of the counterbores made clearin the following specliication taken 21 has an intermediate bore portion 30 formed in connection with the drawing, in which: adjacent the outer ends of the threads 25 which lo Fig. 1 is a vertically sectioned view showing the is ground to t snugly that portion 3l of the rod upper end of a fluid operated pump embodying the adjacent the threads 25, thereby producing an features oi' .my invention v axial alignment of the end of the rod which is Fig. 2 is a vertically sectioned view complemenindependent of the threads 25 and 2i. Eachof `1I tary to Fig. '1, showing the central section of the the counterbores .21 has an outer bore portion 33 15 Dumpembodying theieatures of my invention. L which is ground to a diameter slightly larger Fig. 3 is a vertically sectioned view complethan the rod so that the portion 3l of the rod mentaryto Fig. 2, showing the lower end section within the outer end of the counterbore 21 may of the pump. flex laterally should the rod be slightly out of Referring to the drawing, I show a duid operalignment with other parts of the pump structure l0 ated pump I0 of the general character shown in with which it cooperates. For this purpose, the my copending application Serial No. 138,176, to outer bore portion 33 may be ground to a diamwhich reference ls made for specific details of eter approximately 0.002 inch greater than the construction and method of operation ot the diameter of the portion 3| of the rod. By the use i pump. The upper end of the pump I3 is secured of a construction'as hereinabove described,- the 35 to the lower end of a iiuid delivery pipe II by end of each rod I0, I'I, and i3 is given a spaced which operating fluid under relatively high prestwo-point centralizing engagement with the pissure is delivered to a motor cylinder I2 having a ton to which it is attached. For instance, the motor piston I3 slidably disposed therein, and conical end 23 of each rod engages a conical seat thepump I0 also has a pump4 cylinder I4 having 23 at the inner end of a counterbore 21, and a 3 a pump piston` I! disposed therein. Connected portion 3l of the rod spaced from the end thereof to and projecting upwardly from the power pis.- engages an intermediate portion 33 of the counterton I3 is a pilot rod I3, and a piston rod-I1. is bore 21. Beyond the intermediate portion 33, the provided to connect the power piston and the rod may iiex within the outer end portion 33 of t vmotor piston II. and securedto the lower end of the counterbore' 21 should minute disalignment 35 the motor piston is a rod I3. ItS will be noted that of cooperating parts require the same. the pilot rod I3, the power piston I3, the piston I claim as my invention: rod Il, the pump piston I 3, and the rod I3 are l. A piston and rod structure of the character equippedwith axial passages I3, 23, 2i, 22, and described, comprising: a piston having a counterd0 23, respectively through which high pressure bore with a seat at the inner end thereofrand a 4 `fiuidmay pass from the iluid delivery pipe II to threaded portion adjacent said seat; and a rod a tubular member 23, where it a'cts upwardly adapted to enter said counterbore, said rod having against the lower end ofthe r I3 to balance the a seat engaging portion at its extremity, threads downward pressure on the upper end of the pilot adjacent its extremity for engaging the threads i rod It. of s aid counterbore, and a cylindrical wall portion 5 The pilot rod Itthe piston rod I'l, and the rod adjacent said threadsof said rod forenga'ging the I3 are connected to the pistons I3 and I3,in the wall of said counterbore near the outer ends -of manner shown, by use of external threads v23 said threads ofsaid counterbore.

on the rods which engage threads 2 3 formed 2. A' piston and rod structure of the character i v| near the inner ends of counterbores 21 in the described, comprising: apiston havingacounterpistons, the rods having conical ends 23 .at the bore with a seat at the inner end thereof and a extreme ends thereof which engage conical seats threaded portion adjacent said seat; and a rod 23 at the inner extremities of the counterbores 21', adapted to enter said counterbore,`sai d rod hav' sothat apositive huid seal is thereby formed being a seat engaging portion at its extremity,

I *l tween the ends of the rods and the pistons which threads adjacent itsextremity for' engaging the i threads of said counterbore, and a cylindrical wall 'portion adjacent said threads oi said rod-for en- 4having a fluid passage therein adapted to convey.

fluid through said piston; a piston rodhaving a fluid conduit therein adapted to'communicate with said iluid passage to convey iiuid 4therethrough to or from said'fiuid passage; and means connecting said piston rod to said piston so as to form a iluid-tight` joint therebetween, said means permitting lateral play'` c! said piston -rod relative to said piston.

4. A piston and rod structure described? including: a first piston having a nuid passage therethrough adapted to convey nuid throughsaid pistom' a. 'second pistonv having a -iluid passage therethrough adapted to convey permittingiateral playof said vrods relativeto said fluid through said second' piston; apiston 'rod having a duid-conduit'therein adapted to communicate with said passages to provide nuid comofthe character -munication between said passages;` and means for described, including: a rst piston'having a AfluidA passage therethrough adapted to' convey fluid through said rst piston; a second piston having a uid passagev therethrough adapted to convey iluid through said g second piston; a rst rod adapted to be. connected to saidirst piston; a

second rod for connecting said pistons; a third rod adapted to be connected to said second piston, said rods having fluid conduits therein adapted to communicate with said passages so that fluid may pass in sequence, through said nrst rod, said, A

first piston, said second ro'd, said sec'o'nd piston,

and said third rod; and means for connecting said rods to said pistons so as to form huid-tight joints between said rods and said pistons, "said means 

